Spa shell



FIG. 1 is a first perspective view of a spa shell showing our new design;

FIG. 2 is a top plan view of a spa shell showing my new design;

FIG. 3 is a cross-sectional view taken along line 3—3 of FIG. 2;

FIG. 4 is a cross-sectional view taken along line 4—4 of FIG. 2;

FIG. 5 is a cross-sectional view taken along line 5—5 of FIG. 2;

FIG. 6 is a cross-sectional view taken along line 6—6 of FIG. 2; and,

FIG. 7 is a second perspective view of a spa shell showing our new design.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

The ornamental design for a spa shell, as shown and described. 